A surface grinding device for an automobile part processing equipment

Abstract

The present invention discloses a surface grinding device for an automobile parts processing device. The present invention relates to the technical field of grinding devices and includes a pipe, a curved rail, a driver, and a first grinding device. The pipe is arranged inside the first grinding device. The top of the first grinding device is fixedly connected to the driver. A second grinding device is arranged at one end of the first grinding device away from the pipe. A top groove is formed at the top of the curved rail. The inside of the top groove is slidably connected to the driver. A bottom groove is formed at the top of the top groove. For the surface grinding device for the automobile parts processing device, through the upward movement of the grinding roller, when the pipe moves to the innermost part of the second grinding device, the grinding roller will adhere to the outer surface of the pipe at this time, so as to play the role that when grinding pipes with different shapes, the grinding roller can always accurately adhere to the pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding equipment, and specifically to a surface grinding equipment for automobile part processing equipment. Background Art

[0002] Automobile parts include engine accessories, powertrain accessories, braking system accessories, steering system accessories, and running gear accessories, etc. Many of these parts need to be polished after production, such as engine cylinder heads, clutch covers, and bent pipes. Even after automated processing on the workshop assembly line, defects still occur, resulting in defective rates. Parts that do not meet the quality standards are usually scrapped.

[0003] At the same time, when grinding different bent pipes, not only the fixing tooling needs to be replaced, but also the grinding tool needs to be taken out first and then the pipe needs to be fixed. Such replacement of the tooling will directly affect the overall work efficiency; at the same time, the existing grinding of the bent part is mostly manually operated. Summary of the Invention

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A surface grinding equipment for automobile part processing equipment, including a pipe, a bending rail, a driver, and a first grinding tool. The pipe is arranged inside the first grinding tool. The top of the first grinding tool is fixedly connected to the driver. One end of the first grinding tool away from the pipe is provided with a second grinding tool;

[0005] A top groove is opened at the top of the bending rail. The inside of the top groove is slidably connected to the driver. A bottom groove is opened at the top of the top groove;

[0006] The driver includes a driving component. A transition disk is arranged at the bottom of the driving component. The bottom of the transition disk is fixedly connected to an external connection plate. The bottom of the external connection plate is fixedly connected to the first grinding tool;

[0007] A plug tube is sleeved at the central part of the bottom of the transition disk. The top of the plug tube is connected to the output end of the driving component through a coupling. A sleeve is slidably installed on the outside of the plug tube. The sleeve is slidably installed inside the top groove. The plug tube is slidably installed inside the bottom groove; Starting the driving component, the plug tube connected to it through the coupling will rotate clockwise. Subsequently, the external connection plate connected to the plug tube through the transition disk will also rotate clockwise. Finally, it plays the role of making the first grinding tool grind around the bent part of the pipe with the plug tube as the center.

[0008] The second grinding device includes a motor, a side frame plate is fixedly connected to the surface of the motor, a rotating shaft is arranged on the side of the side frame plate away from the motor, the outer side of the rotating shaft is connected to the output end of the motor through a coupling, six plates are fixedly connected to the outer side of the rotating shaft, a clamping device is threadedly connected to the outer ends of the six plates, and a second grinding assembly is fixedly installed on the side of the six plates away from the side frame plate;

[0009] The first grinding device includes a connecting ring, the top of the connecting ring is fixedly connected to an external plate, a rotating ring is rotatably installed on the inner wall of the connecting ring, an external rolling tooth is fixedly connected to the end face of the rotating ring, a gear is meshed and driven on the outer side of the external rolling tooth, a connecting shaft is fixedly connected to the central part on the outer side of the gear, an extension plate is rotatably installed at the end of the connecting shaft away from the gear, the extension plate is fixedly connected to the connecting ring on the outer side, and a first grinding assembly is fixedly connected to the side of the connecting ring away from the extension plate.

[0010] Preferably, the second grinding assembly includes an inner sliding plate, the inner sliding plate is slidably installed inside the six plates, an insert block is inserted at the outer end of the inner sliding plate, and a grinding roller is fixedly connected to the end of the insert block away from the inner sliding plate. As the grinding roller will move upward, when the pipe moves to the innermost part of the second grinding device, the grinding roller will adhere to the outer surface of the pipe at this time, so as to play a role that when grinding pipes of different shapes, the grinding roller can always accurately adhere to the pipe.

[0011] Preferably, a connecting rod is fixedly connected to the top of the inner sliding plate, and a resisting block is fixedly connected to the end of the connecting rod away from the inner sliding plate.

[0012] Preferably, an external pressure shell is fixedly connected to the bottom of the resisting block, and the bottom side of the external pressure shell adheres to the outer surface of the pipe.

[0013] Preferably, a telescopic rod is fixedly connected to the outer side of the external pressure shell, a connecting frame is slidably installed at the end of the telescopic rod away from the external pressure shell, and the connecting frame is fixedly connected to the outer end of the six plates at the end away from the telescopic rod. The top of the pressing plate is connected to the top ring through a spring, and the spring is always in a stretched state. Therefore, the pressing plate will squeeze the inner sliding plate downward to play a role of pre-fixing the pipe.

[0014] Preferably, the clamping device includes an internal thread shell, a limiting block is fixedly connected to the inside of the internal thread shell, and a pull rod is arranged below the internal thread shell.

[0015] Preferably, a threaded sleeve is slidably installed on the outer side of the pull rod, and the threaded sleeve is fixedly connected to the six plates.

[0016] Preferably, a top ring is fixedly connected to the bottom of the threaded sleeve, a spring is fixedly connected to the bottom of the top ring, and one end of the spring away from the top ring is fixedly connected to a pressing plate. Move the internal threaded housing downward on the threaded sleeve. At this time, the limiting block fixed inside the overload internal threaded housing will squeeze the pull rod. The pull rod is slidably installed inside the threaded sleeve, and the bottom of the pull rod is connected to the pressing plate. Finally, the downward movement of the pressing plate plays a role in officially fixing the pipe.

[0017] Preferably, a bottom bladder is arranged below the pressing plate and beyond the inner sliding plate. The bottom bladder is fixedly installed inside the six-sided plate.

[0018] Preferably, the first grinding assembly includes a clamping edge rail, which is fixedly installed on the outer side of the rotating ring. A threaded rod is threadedly connected to the top of the clamping edge rail, and a U-shaped pipe is sleeved on the bottom of the threaded rod. Move the grinding disc away from the pipe, and then rotate the central block on the U-shaped pipe, so that the winding roller will change its position along the surface of the central block in a clockwise direction to achieve the replacement of the grinding disc.

[0019] Preferably, one end of the U-shaped pipe away from the threaded rod is rotatably connected to a central block. The outer side of the central block is press-fitted with a winding roller, and a grinding disc is fixedly connected to the outer side of the winding roller. Rotate the threaded rod forward, so that the U-shaped pipe sleeved on its bottom will move downward, so that the grinding disc will adhere to the pipe. At the same time, with the rotation of the rotating ring, the grinding disc will play a role in grinding the outer side of the pipe.

[0020] The present invention provides a surface grinding device for an automobile part processing device. It has the following beneficial effects:

[0021] First, for the surface grinding device for the automobile part processing device, through the upward movement of the grinding roller, when the pipe moves to the innermost part of the second grinding device, the grinding roller will adhere to the outer surface of the pipe at this time, so as to play a role that when grinding pipes of different shapes, the grinding roller can always accurately adhere to the pipe.

[0022] Second, for the surface grinding device for the automobile part processing device, through the upward movement of the inner sliding plate slidably installed inside the six-sided plate and the extrusion of the pressing plate, the top of the pressing plate is connected to the top ring through a spring, and the spring is always in a stretched state. Therefore, the pressing plate will extrude the inner sliding plate downward to play a role in pre-fixing the pipe.

[0023] III. For the surface grinding equipment used in the automotive parts processing equipment, when the internal thread housing moves downward on the thread sleeve, the limit block inside the fixed overload internal thread housing will squeeze the pull rod. The pull rod is slidably installed inside the thread sleeve, and the bottom of the pull rod is connected to the pressure plate. Finally, the downward movement of the pressure plate plays a role in officially fixing the pipe.

[0024] IV. For the surface grinding equipment used in the automotive parts processing equipment, by starting the drive assembly, the insertion tube connected to it through the coupling will rotate clockwise. Subsequently, the external connection plate connected to the insertion tube through the transition plate will also rotate clockwise. Finally, it plays a role in grinding the first grinding device around the bending part of the pipe with the insertion tube as the center.

[0025] V. For the surface grinding equipment used in the automotive parts processing equipment, by rotating the threaded rod forward, the U-shaped tube sleeved on its bottom will move downward, so that the grinding sheet adheres to the pipe. At the same time, with the rotation of the rotating ring, the grinding sheet will play a role in grinding the outer side of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the external structure schematic diagram of a surface grinding equipment for an automotive parts processing equipment of the present invention;

[0027] Figure 2 is the enlarged structure schematic diagram of the bent rail part of the present invention;

[0028] Figure 3 is the structure schematic diagram of the driver of the present invention;

[0029] Figure 4 is the structure schematic diagram of the second grinding device of the present invention;

[0030] Figure 5 is the sectional structure schematic diagram of the second grinding assembly of the present invention;

[0031] Figure 6 is the structure schematic diagram of the clamping device of the present invention;

[0032] Figure 7 is the sectional structure schematic diagram of the clamping device of the present invention;

[0033] Figure 8 is the structure schematic diagram of the first grinding device of the present invention;

[0034] Figure 9 is the structure schematic diagram of the first grinding assembly of the present invention.

[0035] In the figure: 1, pipe; 2, bent rail; 3, driver; 4, first grinding device; 5, second grinding device; 6, top groove; 7, bottom groove; 31, drive assembly; 32, external plate; 33, transition disk; 34, insertion tube; 35, housing; 51, motor; 52, side frame plate; 53, rotating shaft; 54, six-sided plate; 55, clamping device; 56, second grinding assembly; 561, inner sliding plate; 562, inserted block; 563, grinding roller; 564, connecting rod; 565, abutting block; 566, outer pressure housing; 567, telescopic rod; 568, connecting frame; 551, inner threaded housing; 552, pull rod; 553, threaded sleeve; 554, spring; 555, pressing plate; 556, bottom bladder; 557, limiting block; 558, top ring; 41, connecting ring; 42, external rolling teeth; 43, extension plate; 44, gear; 45, connecting shaft; 46, first grinding assembly; 47, rotating ring; 461, clamping edge rail; 462, threaded rod; 463, U-shaped tube; 464, central block; 465, winding roller; 466, grinding sheet. Detailed implementation mode

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limited to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0037] The first embodiment is as Figures 1 - 3 shown. The present invention provides a technical solution: a surface grinding device for an automobile part processing device, including a pipe 1, a bent rail 2, a driver 3 and a first grinding device 4. The pipe 1 is arranged inside the first grinding device 4. The top of the first grinding device 4 is fixedly connected to the driver 3. One end of the first grinding device 4 away from the pipe 1 is provided with a second grinding device 5. The top of the bent rail 2 is provided with a top groove 6. The inside of the top groove 6 is slidably connected to the driver 3. The top of the top groove 6 is provided with a bottom groove 7.

[0038] The driver 3 includes a drive assembly 31. The bottom of the drive assembly 31 is provided with a transition disk 33. The bottom of the transition disk 33 is fixedly connected to an external plate 32. The bottom of the external plate 32 is fixedly connected to the first grinding device 4. The center of the bottom of the transition disk 33 is sleeved with an insertion tube 34. The top of the insertion tube 34 is connected to the output end of the drive assembly 31 through a coupling. The outside of the insertion tube 34 is slidably installed with a housing 35. The housing 35 is slidably installed inside the top groove 6. The insertion tube 34 is slidably installed inside the bottom groove 7.

[0039] By moving the housing 35 along the inside of the top groove 6, the first grinding tool 4 fixedly connected to the external connecting plate 32 will perform a linear grinding method on the outer side of the pipe 1. However, when the housing 35 moves to the junction of the top groove 6 and the bottom groove 7, the insertion pipe 34 slidably installed inside the housing 35 will extend downward from the housing 35 and enter the inside of the bottom groove 7, and the first grinding tool 4 is exactly at the welding point of the horizontal end and the bent part of the pipe 1. The cross-sectional area of the housing 35 fits the top groove 6, and at the same time, the area of the top groove 6 is larger than that of the bottom groove 7. Then, the driving assembly 31 is started, so that the insertion pipe 34 connected to it through the coupling will rotate clockwise, and then the external connecting plate 32 connected to the insertion pipe 34 through the transition plate 33 will also rotate clockwise, finally making the first grinding tool 4 grind around the bent part of the pipe 1 with the insertion pipe 34 as the center.

[0040] The part of the insertion pipe 34 extending into the junction of the top groove 6 and the bottom groove 7 is exactly the center point of the bent part of the pipe 1. Then, the insertion pipe 34 is moved along the inside of the bottom groove 7 to grind the entire pipe 1.

[0041] Second Embodiment, as Figures 4 - 7 shown, the second grinding tool 5 includes a motor 51. A side frame plate 52 is fixedly connected to the surface of the motor 51. A rotating shaft 53 is provided on the side of the side frame plate 52 away from the motor 51. The outer side of the rotating shaft 53 is connected to the output end of the motor 51 through a coupling. Six plates 54 are fixedly connected to the outer side of the rotating shaft 53. Clamping devices 55 are threadedly connected to the outer ends of the six plates 54. A second grinding assembly 56 is fixedly installed on the side of the six plates 54 away from the side frame plate 52.

[0042] The second grinding assembly 56 includes an inner sliding plate 561. The inner sliding plate 561 is slidably installed inside the six plates 54. An insert block 562 is inserted into the outer end of the inner sliding plate 561. A grinding roller 563 is fixedly connected to the end of the insert block 562 away from the inner sliding plate 561. A connecting rod 564 is fixedly connected to the top of the inner sliding plate 561. A resisting block 565 is fixedly connected to the end of the connecting rod 564 away from the inner sliding plate 561. An outer pressure shell 566 is fixedly connected to the bottom of the resisting block 565. The bottom side of the outer pressure shell 566 is attached to the outer surface of the pipe 1. A telescopic rod 567 is fixedly connected to the outer side of the outer pressure shell 566. A connecting frame 568 is slidably installed at the end of the telescopic rod 567 away from the outer pressure shell 566. The end of the connecting frame 568 away from the telescopic rod 567 is fixedly connected to the outer end of the six plates 54.

[0043] By moving the end of the pipe 1 towards the second grinding device 5 and inserting the periphery of the end of the pipe 1 into the outer pressure shell 566, the outer pressure shell 566 will drive the abutting block 565 fixed on its surface to move upward. At the same time, the telescopic rod 567 fixed on the surface of the outer pressure shell 566 will contract upward. In addition, a connecting rod 564 is fixedly connected to the top of the abutting block 565, and the other end of the connecting rod 564 is connected to the inner sliding plate 561. Therefore, the inner sliding plate 561 will move upward within the six-sided plate 54. The insert block 562 is inserted into the inner sliding plate 561, and the other end of the insert block 562 is connected to the grinding roller 563. Therefore, the grinding roller 563 will move upward. When the pipe 1 moves to the innermost part of the second grinding device 5, the grinding roller 563 will adhere to the outer surface of the pipe 1 at this time, so as to play a role that when grinding pipes 1 with different shapes, the grinding roller 563 can always accurately adhere to the pipe 1.

[0044] The function of the insert block 562 inserted into the inner sliding plate 561 is to facilitate the disassembly and replacement of the grinding roller 563.

[0045] The clamping device 55 includes an internally threaded shell 551. A limiting block 557 is fixedly connected inside the internally threaded shell 551. A pull rod 552 is arranged below the internally threaded shell 551. A threaded sleeve 553 is slidably installed on the outer side of the pull rod 552. The outer side of the threaded sleeve 553 is fixedly connected to the six-sided plate 54. A top ring 558 is fixedly connected to the bottom of the threaded sleeve 553. A spring 554 is fixedly connected to the bottom of the top ring 558. One end of the spring 554 away from the top ring 558 is fixedly connected to a pressing plate 555. A bottom bladder 556 is arranged below the pressing plate 555 and passes over the inner sliding plate 561. The bottom bladder 556 is fixedly installed inside the six-sided plate 54.

[0046] When the grinding roller 563 adheres to the outer surface of the pipe 1, the inner sliding plate 561 slidably installed inside the six-sided plate 54 will move upward and press the pressing plate 555. The top of the pressing plate 555 is connected to the top ring 558 through the spring 554, and the spring 554 is always in a stretched state. Therefore, the pressing plate 555 will press the inner sliding plate 561 downward to play a role in pre-fixing the pipe 1.

[0047] Then move the internally threaded shell 551 downward on the threaded sleeve 553. At this time, the limiting block 557 fixed inside the internally threaded shell 551 will press the pull rod 552. The pull rod 552 is slidably installed inside the threaded sleeve 553, and the bottom of the pull rod 552 is connected to the pressing plate 555. Finally, the downward movement of the pressing plate 555 plays a role in formally fixing the pipe 1.

[0048] Third embodiment, asFigures 8 - 9 As shown, the first grinding device 4 includes a chain 41. The top of the chain 41 is fixedly connected to an external connection plate 32. A rotating ring 47 is rotatably installed on the inner wall of the chain 41. An external rolling gear 42 is fixedly connected to the end face of the rotating ring 47. A gear 44 is meshed and driven on the outside of the external rolling gear 42. A connecting shaft 45 is fixedly connected to the central part on the outside of the gear 44. One end of the connecting shaft 45 away from the gear 44 is rotatably installed with an extension plate 43. The outside of the extension plate 43 is fixedly connected to the chain 41. One side of the chain 41 away from the extension plate 43 is fixedly connected to a first grinding assembly 46.

[0049] The first grinding assembly 46 includes a clamping edge rail 461 which is fixedly installed on the outside of the rotating ring 47. A threaded rod 462 is threadedly connected to the top of the clamping edge rail 461. A U-shaped pipe 463 is sleeved at the bottom of the threaded rod 462. One end of the U-shaped pipe 463 away from the threaded rod 462 is rotatably connected to a central block 464. A winding roller 465 is press-fitted on the outside of the central block 464. A grinding sheet 466 is fixedly connected to the outside of the winding roller 465.

[0050] By starting the gear 44, the externally meshed external rolling gear 42 will rotate. Among them, the external rolling gear 42 rotates in the chain 41 through the rotating ring 47 fixedly connected thereto. Subsequently, rotate the threaded rod 462 forward, so that the U-shaped pipe 463 sleeved at its bottom will move downward, so that the grinding sheet 466 adheres to the pipe 1. At the same time, along with the rotation of the rotating ring 47, the grinding sheet 466 will play a role in grinding the outside of the pipe 1.

[0051] Move the grinding sheet 466 away from the pipe 1, and then rotate the central block 464 on the U-shaped pipe 463, so that the winding roller 465 will change its position in a clockwise direction along the surface of the central block 464 to play a role in replacing the grinding sheet 466.

[0052] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A surface grinding device for an automobile part processing device, comprising a pipe (1), a bent rail (2), a driver (3) and a first grinding device (4), characterized in that: The pipe (1) is arranged inside the first grinding device (4). The top of the first grinding device (4) is fixedly connected to the driver (3). One end of the first grinding device (4) away from the pipe (1) is provided with a second grinding device (5). A top groove (6) is formed at the top of the curved rail (2). The inside of the top groove (6) is slidably connected to the driver (3). A bottom groove (7) is formed at the top of the top groove (6). The driver (3) includes a driving component (31). A transition disk (33) is arranged at the bottom of the driving component (31). An external connection plate (32) is fixedly connected to the bottom of the transition disk (33). The bottom of the external connection plate (32) is fixedly connected to the first grinding device (4). A plug tube (34) is sleeved at the central part of the bottom of the transition disk (33). The top of the plug tube (34) is connected to the output end of the driving component (31) through a coupling. A sleeve (35) is slidably installed on the outside of the plug tube (34). The sleeve (35) is slidably installed inside the top groove (6). The plug tube (34) is slidably installed inside the bottom groove (7). The second grinding device (5) includes a motor (51). A side frame plate (52) is fixedly connected to the surface of the motor (51). A rotating shaft (53) is arranged on one side of the side frame plate (52) away from the motor (51). The outside of the rotating shaft (53) is connected to the output end of the motor (51) through a coupling. Six plates (54) are fixedly connected to the outside of the rotating shaft (53). A clamping device (55) is threadedly connected to the outer ends of the six plates (54). A second grinding component (56) is fixedly installed on one side of the six plates (54) away from the side frame plate (52). The first grinding device (4) includes a connecting ring (41). The top of the connecting ring (41) is fixedly connected to the external connection plate (32). A rotating ring (47) is rotatably installed on the inner wall of the connecting ring (41). External rolling teeth (42) are fixedly connected to the end face of the rotating ring (47). A gear (44) is meshed and driven on the outside of the external rolling teeth (42). A connecting shaft (45) is fixedly connected to the central part of the outside of the gear (44). One end of the connecting shaft (45) away from the gear (44) is rotatably installed with an extension plate (43). The outside of the extension plate (43) is fixedly connected to the connecting ring (41). A first grinding component (46) is fixedly connected to one side of the connecting ring (41) away from the extension plate (43).

2. The surface grinding device for an automotive parts processing device according to claim 1, wherein: The second grinding component (56) includes an inner sliding plate (561). The inner sliding plate (561) is slidably installed inside the six plates (54). An insert block (562) is inserted at the outer end of the inner sliding plate (561). A grinding roller (563) is fixedly connected to one end of the insert block (562) away from the inner sliding plate (561).

3. A surface grinding device for an automotive parts processing device according to claim 2, characterized in that: A connecting rod (564) is fixedly connected to the top of the inner sliding plate (561). A resisting block (565) is fixedly connected to one end of the connecting rod (564) away from the inner sliding plate (561).

4. The surface grinding device for an automotive parts processing equipment according to claim 3, characterized in that: The bottom of the abutting block (565) is fixedly connected with an outer pressing shell (566), and the bottom side of the outer pressing shell (566) is attached to the outer surface of the pipe (1).

5. The surface grinding device for an automotive parts processing device according to claim 4, characterized in that: An expansion rod (567) is fixedly connected to the outside of the outer pressing shell (566). A connecting frame (568) is slidably installed at one end of the expansion rod (567) away from the outer pressing shell (566), and one end of the connecting frame (568) away from the expansion rod (567) is fixedly connected to the outer end of the six - bar plate (54).

6. The surface grinding device for an automobile part processing device according to claim 1, characterized in that: The clamping device (55) includes an internally - threaded shell (551). A limiting block (557) is fixedly connected inside the internally - threaded shell (551), and a pull rod (552) is arranged below the internally - threaded shell (551).

7. The surface grinding device for an automotive parts processing equipment according to claim 6, characterized in that: A threaded sleeve (553) is slidably installed on the outside of the pull rod (552), and the outside of the threaded sleeve (553) is fixedly connected to the six - bar plate (54).

8. The surface grinding device for an automotive parts processing device according to claim 7, characterized in that: A top ring (558) is fixedly connected to the bottom of the threaded sleeve (553). A spring (554) is fixedly connected to the bottom of the top ring (558), and one end of the spring (554) away from the top ring (558) is fixedly connected to a pressing plate (555).

9. The surface grinding device for an automotive part processing device according to claim 8, characterized in that: A bottom bladder (556) is arranged below the pressing plate (555) and passes over the inner sliding plate (561). The bottom bladder (556) is fixedly installed inside the six - bar plate (54).

10. A surface grinding device for an automotive parts processing device according to claim 1, characterized in that: The first grinding assembly (46) includes a clamping edge rail (461). The clamping edge rail (461) is fixedly installed on the outside of the rotating ring (47). A threaded rod (462) is threadedly connected to the top of the clamping edge rail (461), and a U - shaped pipe (463) is sleeved on the bottom of the threaded rod (462).

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